M-11
Shvetsov M-11F
Type	Radial engine
Manufacturer	Shvetsov
First run	1923
Number built	100,000+

The Shvetsov M-11 is a five cylinder air-cooled radial aircraft engine produced in the Soviet Union between 1923 and 1952.^[1]

Contents 1 Design and development 2 Applications 3 Specifications (M-11A) 4 See also 5 References 5.1 Notes 5.2 Bibliography

[edit] Design and development

The Shvetsov M-11 was designed under a 1923 competition in the Soviet Union for a new engine to power trainer aircraft. It is a single-row five-cylinder air-cooled radial piston engine with aluminum cylinder heads. Uniquely, pushrods actuating the valves were driven by individual cams on each cylinder rather than a single central cam. The initial versions of the M-11 suffered from a short service life of only 50 hours. The basic M-11 engine had a power output of 100 hp (73 kW), the newer M-11D variant was higher at 125 hp (92 kW). The ultimate version, M-11FR, introduced in 1946, increased power output to 160 hp at 1,900 rpm on takeoff and 140 hp at cruise and had provisions for a variable-pitch propeller, accessory drive (for vacuum pumps, compressors, generators, etc.) and featured a floatless carburetor.

[edit] Applications

The M-11 powered a number of aircraft, including the Polikarpov Po-2, Yakovlev UT-1, Yakovlev UT-2, Yakovlev Yak-6, Yakovlev Yak-12, Yakovlev Yak-18 and Mikoyan-Gurevich MiG-8. It also powered the Polish LWD Junak, PZL S-4 Kania and Bulgarian Laz-7M (Лаз-7М ). The M-11 remained in production until 1952 with an estimated total of over 100,000 engines made. Several hundreds of M-11D and M-11FR-1 variants were manufactured under license in the Polish WSK-Kalisz works in Kalisz.

[edit] Specifications (M-11A)

Data from Kotelnikov^[2]

General characteristics

• Type: 5-cylinder air-cooled radial engine
• Bore: 125mm (4.92 in)
• Stroke: 140mm (5.51 in)
• Displacement: 8.6 L (525 in³)
• Dry weight: 165 kg (363 lb)

Components

• Cooling system: Air-cooled

Performance

• Power output:
  
  • 82 kW (110 hp) at 1,650 rpm for takeoff
  • 75 kW (100 hp) cruise
• Specific power: 9.5 kW/L (0.21 hp/in³)
• Compression ratio: 5.0:1
• Power-to-weight ratio: 0.50 kW/kg (0.30 hp/lb)

[edit] See also

Comparable engines

• Armstrong Siddeley Mongoose
• Kinner R-5
  

Related lists

• List of aircraft engines
  

[edit] References

[edit] Notes

[edit] Bibliography

v • d • e Shvetsov aircraft engines Radial engines ASh-21 · ASh-62 · ASh-73 · ASh-82 · M-11 · M-25

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